Insider profile
Giljum Matthew C.
This page tracks every SEC Form 4 filing since April 2023 by Giljum Matthew C., Sr. VP and CFO: 29 transactions in total, including 0 open-market purchases and 7 sales. Each record is parsed directly from the original filing, with amendments reconciled so a corrected filing never double-counts.
Activity summary
No insider transactions in the last 30 days. The most recent was on January 14, 2025, when Giljum Matthew C. sold 26,054 shares. The full history is listed below.
Quarterly balance
Buy and sell value by quarter, Q4 23 to Q4 24. Giljum Matthew C. sold in every quarter shown.
Bars below the rule are sales, above are purchases. Largest quarter on the chart is $2.3M.
Track record
Transaction History
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jan 14, 2025 | Giljum Matthew C. | ARCH | Disposition | 26,054 | — | — |
| Jan 14, 2025 | Giljum Matthew C. | ARCH | Disposition | 40,005 | — | — |
| Oct 14, 2024 | Giljum Matthew C. | ARCH | Sale10b5 | 169 | $144.75 | $24K |
| Oct 13, 2024 | Giljum Matthew C. | ARCH | Option Exercise | 1,683 | — | — |
| Oct 13, 2024 | Giljum Matthew C. | ARCH | Tax Withholding | 744 | $145.86 | $109K |
24 more transactions hidden
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Reading an insider's Form 4 history
Corporate insiders — directors, officers, and holders of more than 10% of a company's stock — must report their trades to the SEC on Form 4 within two business days. Looking at one insider's filings over time shows whether they tend to buy on the open market (a discretionary use of their own money, generally the strongest signal), sell, or simply receive and exercise equity awards as compensation.
The track record above measures how this insider's past open-market purchases performed in the months after each filing. Trades made under a pre-scheduled Rule 10b5-1 plan are flagged because they carry no timing signal. To pull any insider's full history programmatically, see the insider trading API or our guide to reading Form 4 filings.